Malygos, the Spell-Weaver

Flying
When Malygos, the Spell-Weaver enter the battlefield, the next instant or sorcery spell you
cast this turn cost {0} to cast.
{3}{u}{b}{r} : Exile Malygos, the Spell-Weaver, then return him to the battlefield transformed under
his owner's control. Activate this ability only any
time you could cast a sorcery.